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Serratus posterior inferior

The serratus posterior inferior
muscle is one of the back's two intermediate muscles (the other is called the serratus posterior superior muscle),
which means it’s neither a surface nor a deep muscle.

The serratus posterior inferior muscle is located in the mid to lower back
and forms a V-shape. It originates from the spinal processes (the points of the
vertebrae closest to the skin) of vertebrae T11 to T12 and L1 to L2. It travels
upward from its origin and inserts into the lower borders of ribs 9-12.

The serratus posterior inferior muscle is thin but becomes more muscular at
its lowest points. It is supplied with blood by the lowest posterior
intercostal artery, the subcostal artery, and the first two lumbar arteries.
The nerves in this muscle come from the ventral primary rami.

The serratus posterior inferior muscle is a
respiratory muscle. The function of the serratus posterior inferior muscle is
to pull down the lower ribs, assisting with forced exhaling.